Giant permanent dipole moment of 2D excitons bound to a single stacking fault
| Autor: | Karin, Todd, Linpeng, Xiayu, Glazov, M. M., Durnev, M. V., Ivchenko, E. L., Harvey, Sarah, Rai, Ashish K., Ludwig, Arne, Wieck, Andreas D., Fu, Kai-Mei C. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.94.041201 |
| Popis: | We investigate the magneto-optical properties of excitons bound to single stacking faults in high-purity GaAs. We find that the two-dimensional stacking fault potential binds an exciton composed of an electron and a heavy-hole, and confirm a vanishing in-plane hole $g$-factor, consistent with the atomic-scale symmetry of the system. The unprecedented homogeneity of the stacking-fault potential leads to ultra-narrow photoluminescence emission lines (with full-width at half maximum ${\lesssim 80~\mu \text{eV} }$) and reveals a large magnetic non-reciprocity effect that originates from the magneto-Stark effect for mobile excitons. These measurements unambiguously determine the direction and magnitude of the giant electric dipole moment (${\gtrsim e \cdot 10~\text{nm}}$) of the stacking-fault exciton, making stacking faults a promising new platform to study interacting excitonic gases. Comment: 5 pages, 3 figures plus supplement |
| Databáze: | arXiv |
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